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| 氢含量试验 | |||
| 测氢试验; 測定焊条质量的含氢量试验 | |||
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hydrogen test : 9 phrases in 6 subjects |
| Earth sciences | 1 |
| Metallurgy | 3 |
| Oil processing plants | 1 |
| Reproductive biology | 1 |
| Space | 1 |
| Technology | 2 |
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